Problem while installing firefox in ubuntu 12.04.1

Hi.. I am installing firefox but getting this error, HOw to solve this ? I think this is because i removed squid but not completely. And somebody please suggest me good article or blog to install squid proxy server on my ubuntu. As i have only 1 NIC so how to route whole traffic from it. I tried installing squid once but i could not able to access squid main page. So i removed. But then in can't even install firefox.

Re: Problem while installing firefox in ubuntu 12.04.1

Re: Problem while installing firefox in ubuntu 12.04.1

Just curious but please explain why you're root? And The following packages were automatically installed and are no longer required: in your first post seemed to want to delete quite a lot of stuff that seems fundamental to the OS.